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通过单面剪切试验研究冻融环境下复合板-混凝土界面的退化规律和机理。经过冻融循环(30次)后,界面的极限承载力和断裂能急剧下降,冻融循环次数增加,界面的极限承载力的下降幅度减小,断裂能保持较为稳定。复合板-混凝土体系内含水量增加将加速复合板-混凝土的界面断裂能和极限承载力下降程度。冻融循环后,复合板-混凝土的界面破坏模式由混凝土撕裂转变为混合破坏模式。
Study on the Degradation Law and Mechanism of Composite Panel - Concrete Interface in Freeze - thaw Environment by Single - sided Shear Test. After the freeze-thaw cycle (30 cycles), the ultimate bearing capacity and fracture energy of the interface decreased sharply, the number of freeze-thaw cycles increased, the decrease of the ultimate bearing capacity of the interface decreased, and the fracture energy remained relatively stable. The increase of water content in composite board-concrete system will accelerate the decrease of interfacial fracture energy and ultimate bearing capacity of composite board-concrete. After the freeze-thaw cycles, the interface failure mode of composite board-concrete changed from concrete tearing to mixed failure mode.